Drill-steel puller



May 9, 1933.

c. M. JACKSON 1,907,970

DRILL STEEL FULLER Filed March 1].,l 1952 INVENTOR C-M clarkson BY Q .9.5m

ATTORNEY Patented May 9, 1933 A,STATES PATENT OFFICE CLARENCE M. JACKSON, OF BOULDER CITY, NEVADA DRILL-STEEL PULLER ,Application ledMarch 171, 1932. Serial No. 598,121.

This invention relatesrto devices for removing rock drills when they havebecome `stuck in their `holes-a frequent occurrence in construction -worl -especially in loose or gravelly strata as is well known. Sometimes a considerable number of jack ham- 1lmersor similar steels become stuck beyond recovery during the operation of" a single -crew inthe course of a shift. In addition to A'"lithe cost ofthe steel itself, which is considerableythereisa greater loss to the 'contractor dueto the timeland the labor wasted .on abandonedholes, the cost of putting the steel on4 the job, lwhich is `usually anv appreciljable item, and the `delayto vthe drill and 5 Iagainstthe wrench-and in any case the force other `crews and equipment whose function- .ingjdepends on the completion of the f holes and the setting off o f the blasts.

Atpresent the sole method in use to remove stuck steel is 1 by engaging the same with a crude-'form of wrench` and pounding up on the wrench. Thereis frequently lit- ,1 tlevor no room in rwhich to swing a hammer so Athat only weakblows will be delivered of the blow is never exactly straight up but 'is more of a glancing nature so thatat best it `islnot highly eii'ective.V This method is y, obviously crude and ineflcient so that steels n """3'3 must frequently be abandoned after considerable'time has been lost in thus attempting tosalvage the same. l

` The `principalobject of my invention is to eliminate this ineiiicient and crude method ofsteelrecoveryby providing a tool for the vpurpose by means of which the tool may be upulled straight up and with which a great leverage may be obtained in the pulling action. `The tool is also arranged so that it "M0, may be quickly and easily mounted in connection with the steel andcan be elfectively used no matter what the ground contour or conditions adjacent the steel maybe.

A? furitherfobject ofthe inventionis to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish bymeans of such structure and relative arrangement of,

parts `as will fully appearby a perusalof Referring now more particularlyto` the characters of. reference onthe drawing,l the tool comprises a threaded ack stem l having an enlarged head 2 on its upper end provided with a transverse hole for removable engagement -with a turning bar 3. A ring, nut 4 is` adjustably threaded on the stem. JA relatively small unthreaded and short stem `5 depends from the screw stem asa continuation thereof, and terminates in a head 6, larger than the stem 5 but smaller than the threaded portion of the stem l so that the nut 4 may be slipped over the head 6.

When being arranged for use the head 6 is engaged with the top of the stuckdrill steel 7 which always has a collar or flange 8 rigid therewith a short distance from its upper end. To then tie the head 6 and drill steel together in longitudinally alined and pulling relation I provide a pairof matching semicircular sleeves 9. These sleeve sections are drilled lengthwise to form a bore to receive the stem 5 and steel 7; which bore has an enlarged portion 10 to receive the head 6 and an enlarged portion l1 to receive Athe `langeS.

The portion l0 is arranged to snugly fit-the --the ground surrounding'the drill steel.

head 6, since said head always occupies the same position relative to the jack stem. The portion 11 however is deeper than the thickness of the iiange 8 since the position of the latter on the drill steel may vary somewhat and it is desirable that one pair of sleeves shall be capable of use with any steel. The matching sleeves being placed about the parts, they are held together by a single sleeve 12 removably slipped over the same from above and limited in its downward movement by a {ia-nge 13 on its upper end which overhangsand rests on the top of the sleeve 9. The sleeve 12 must be placed on the jack stem from its lower end before 4the latter is engaged with the drill steel since it is smaller than the nut 4 or head 2.

A rigid tubular unit 14 is then slipped over the j acl; stem from above and before the bar 3 is mounted in place and allowed to engage This tubing also fits over the sleeve 12 inclearance relation thereto, its length being such'that its upper end-is below, the head 2 and ring nut 4.- In order that the unit may lit -all conditions. I preferably provide as equipment with the tool a plurality of sections of tubing of different lengths adapted to be detachably fitted to each other as by means of bell'con nections, as at 15.

I then place a C collar 16 on top of the tub- `ing under the nut 4 and on which the latter rests; the openingin the collar being large enough to take the stem 4 but not the nut.

With the parts of the tool thus assembled in connectionwith the drill steel it will be seen that turning of the jack stem inthe proper direction relative to the cut of the threads will cause the nut4- to be pressed firmly against the collar 16 while the jack stem is raised. Since the sleeves 9 are attached to the lower endY of the jack stem and are engaged with the steel flange, the steel will be pulled up withy the jack stem. Also, since the jack is longitudinally alined with the steel the pull on the latter will be axially of thev steel, or so that it will be pulled straight out .of the hole withoutany tendency to binding or distortion, The pulling pressure which may be applied to the jack stem is limited solely by the strength of the stem supporting tubing and the length of the bar 3 all of whichmay be designed of such material and 0f such proportions as to withstand any pres- `sures which it may ever be necessary to apply.

. Y While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as deined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. A drill-steel puller comprising a screw stem adapted to be longitudinally alined with a steel partially embedded in the ground, means to tie the steel and stem together in pulling relationship, means to rotate the stem, a tubular unit disposed over the stem and steel and engaging the ground, a nut on the stem, and a member about the stem under the nut to be engaged thereby and supported by the upper end of the unit; said memberbeing in the form of a C-collar separate from the unit and having a side opening to receive the l'stem,fwhereby said member may be placed in position after the unit is disposed in place.

2. A drill-steel puller comprising a screw stem adapted to be longitudinally alined with a steel partially embedded in the ground, means to tie the'steel and stem together in pulling relationship, means to rotate the stem, a tubular unit disposed over the stem and steel and engaging the ground, a nut on the stem, saidunit being oflargerinterior diameter than the nut wherebyV it may be slipped over the stem and nut from above, and a member separate from and adapted to be disposed between the nut and unit after the latter is in place so as to rest on topof the unit and form a support for the nut.

v3. A drill-steel pullercomprising a screw stem adapted to be longitudinally alined with a steel ypartially embedded in the ground, said steel having an enlarged flange adjacent its upper end, a head formed on the lower end of the stem below the threaded portion to rest on top of the steel, means to holdl the head and flange together in pulling relationship and means between the stem and ground to cause the stem when rotated to impart an upward movement tothe stem.

4. A drill-'steel puller comprising a screw stem adapted to be longitudinally alined with a steel partially embedded in the ground, said steel having an enlarged flange adjacent its upper end,.a head formed on the lower end of the stem below the threaded portion to rest on top of the steel, cooperating vertically split' sleeve sections together having a Acentrally disposed bore to receive the upper portion of the steel and the portion of the stem immediately above the head, said bore having enlarged portions to 'receive the head and steel-flange, means to hold the sleeve sections in cooperating relationship and means between the screw stem and ground to cause the stem when rotated to impart an upward movement to the stem; 1

. 5. A'structure as in claim 4, in which said sleeve holding means comprises a tube to fit over the same and having stop means to limit its downward movement.

In testimony whereof I aiix my si nature.

CLARENCE M. JAC SON. 

